create_filter
Create Gmail filters to automatically organize emails by applying labels, forwarding messages, or removing labels based on sender, subject, attachments, or search queries.
Instructions
Creates a filter
Input Schema
TableJSON Schema
| Name | Required | Description | Default |
|---|---|---|---|
| criteria | Yes | Filter criteria | |
| action | Yes | Actions to perform on messages matching the criteria |
Implementation Reference
- src/index.ts:999-1004 (handler)The handler function for the 'create_filter' tool. It invokes the shared handleTool utility to create an OAuth-authenticated Gmail client and calls the Gmail API's users.settings.filters.create method with the provided criteria and action parameters, then formats the response.async (params) => { return handleTool(config, async (gmail: gmail_v1.Gmail) => { const { data } = await gmail.users.settings.filters.create({ userId: 'me', requestBody: params }) return formatResponse(data) }) }
- src/index.ts:981-998 (schema)Zod input schema for the 'create_filter' tool, validating criteria (conditions like from, to, subject, query, etc.) and action (labels to add/remove or forward).{ criteria: z.object({ from: z.string().optional().describe("The sender's display name or email address"), to: z.string().optional().describe("The recipient's display name or email address"), subject: z.string().optional().describe("Case-insensitive phrase in the message's subject"), query: z.string().optional().describe("A Gmail search query that specifies the filter's criteria"), negatedQuery: z.string().optional().describe("A Gmail search query that specifies criteria the message must not match"), hasAttachment: z.boolean().optional().describe("Whether the message has any attachment"), excludeChats: z.boolean().optional().describe("Whether the response should exclude chats"), size: z.number().optional().describe("The size of the entire RFC822 message in bytes"), sizeComparison: z.enum(['smaller', 'larger']).optional().describe("How the message size in bytes should be in relation to the size field") }).describe("Filter criteria"), action: z.object({ addLabelIds: z.array(z.string()).optional().describe("List of labels to add to messages"), removeLabelIds: z.array(z.string()).optional().describe("List of labels to remove from messages"), forward: z.string().optional().describe("Email address that the message should be forwarded to") }).describe("Actions to perform on messages matching the criteria") },
- src/index.ts:979-1005 (registration)Registration of the 'create_filter' tool on the MCP server, including name, description, input schema, and handler function.server.tool("create_filter", "Creates a filter", { criteria: z.object({ from: z.string().optional().describe("The sender's display name or email address"), to: z.string().optional().describe("The recipient's display name or email address"), subject: z.string().optional().describe("Case-insensitive phrase in the message's subject"), query: z.string().optional().describe("A Gmail search query that specifies the filter's criteria"), negatedQuery: z.string().optional().describe("A Gmail search query that specifies criteria the message must not match"), hasAttachment: z.boolean().optional().describe("Whether the message has any attachment"), excludeChats: z.boolean().optional().describe("Whether the response should exclude chats"), size: z.number().optional().describe("The size of the entire RFC822 message in bytes"), sizeComparison: z.enum(['smaller', 'larger']).optional().describe("How the message size in bytes should be in relation to the size field") }).describe("Filter criteria"), action: z.object({ addLabelIds: z.array(z.string()).optional().describe("List of labels to add to messages"), removeLabelIds: z.array(z.string()).optional().describe("List of labels to remove from messages"), forward: z.string().optional().describe("Email address that the message should be forwarded to") }).describe("Actions to perform on messages matching the criteria") }, async (params) => { return handleTool(config, async (gmail: gmail_v1.Gmail) => { const { data } = await gmail.users.settings.filters.create({ userId: 'me', requestBody: params }) return formatResponse(data) }) } )
- src/index.ts:49-65 (helper)Shared helper function used by all Gmail API tools, including create_filter, to handle OAuth2 authentication, client creation, credential validation, API call execution, and error handling.const handleTool = async (queryConfig: Record<string, any> | undefined, apiCall: (gmail: gmail_v1.Gmail) => Promise<any>) => { try { const oauth2Client = queryConfig ? createOAuth2Client(queryConfig) : defaultOAuth2Client if (!oauth2Client) throw new Error('OAuth2 client could not be created, please check your credentials') const credentialsAreValid = await validateCredentials(oauth2Client) if (!credentialsAreValid) throw new Error('OAuth2 credentials are invalid, please re-authenticate') const gmailClient = queryConfig ? google.gmail({ version: 'v1', auth: oauth2Client }) : defaultGmailClient if (!gmailClient) throw new Error('Gmail client could not be created, please check your credentials') const result = await apiCall(gmailClient) return result } catch (error: any) { return `Tool execution failed: ${error.message}` } }